docs: add README explaining snapshot origin

Snapshot extracted from EliverLara/Sweet (kde/cursors/Sweet-cursors)
on 2025-09-28. Documents the rationale for keeping a frozen one-shot
mirror instead of tracking upstream, and points to Gigas002/Sweet for
users who want a maintained variant.

README.md

@@ -0,0 +1,31 @@
+# Sweet-cursors
+
+Cursor theme for the moonarch ecosystem — a frozen snapshot extracted from
+the upstream [Sweet](https://github.com/EliverLara/Sweet) project.
+
+## Origin
+
+Files were copied verbatim from `kde/cursors/Sweet-cursors/` of
+`EliverLara/Sweet` on 2025-09-28. Upstream added the cursor theme in a
+single commit on 2020-06-11 and never modified it again; the `kde/`
+directory has since been removed from upstream entirely.
+
+This repository exists solely to provide a small, standalone source for the
+[`sweet-cursors-git`](https://gitea.moonarch.de/nevaforget/moonarch-pkgbuilds/src/branch/main/sweet-cursors-git)
+PKGBUILD — cloning the full Sweet KDE theme monorepo just to package one
+subdirectory adds unnecessary overhead to the CI build pipeline.
+
+## No upstream sync
+
+This is intentionally a one-shot snapshot, not a tracking mirror. There is
+nothing to pull from `EliverLara/Sweet`: cursors haven't changed upstream
+since 2020, and the source path no longer exists.
+
+For a maintained variant with newer cursor work and an SVG-based build
+pipeline, see [`Gigas002/Sweet`](https://github.com/Gigas002/Sweet)
+(branch `cursors`) and the AUR package `sweet-cursors-git` maintained by
+Gigas002.
+
+## License
+
+GPL-3.0, inherited from the upstream Sweet project.